Hour selection window no longer appears

Hi, I have been trying some plugins to try to get around the issue that Appointments+ does not support multiple timezones and unfortunately I have broken something because the pop-up allowing me to select which hour I want an appointment in is no longer showing up. Tried on 2 machines, I have tried disabling the time converter, tried dis/reenabling Appointments plus. still cannot select a timeslot to complete a booking. Are you able to take a quick look and advise what I am doing wrong?

http://grantfiner.com/make-an-appointment/

Support access is enabled. Thank you.